To address the aerodynamic problems of new generation high speed trains, force measurement and PIV tests were performed on a high speed train model in the Cryogenic Wind Tunnel Cologne (DNW-KKK) at high Reynolds numbers. The Cryogenic Wind Tunnel Cologne is a low speed wind tunnel. By cooling the test gas down to 100K the Reynolds number can be raised by a factor of 5.5. The train model is connected to the support via girth gears, isolation plates, balance and angle of attack drive. A separate splitter plate is used to reduce the influence of the tunnel boundary layer. Test results showed that the repeatability of the force measuring system in DNW-KKK is high both at ambient and cryogenic operational mode. A PIV setup was used to investigate the vortex formed at the lee side of the train. The laser light sheet can be adjusted by means of a movable mirror and traversing equipment, so that the vortices at different sections and different yawing angles of the model can be measured. The PIV camera is located in a heated box and can be focused remotely. With these steps the PIV measurement can be performed down to 100K.


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    Titel :

    Road Vehicle Testing at High Reynolds Numbers in the Cryogenic Wind Tunnel Cologne DNW-KKK


    Beteiligte:
    Junnai Zhai, (Autor:in) / Rebstock, R. (Autor:in) / Becker, W. (Autor:in) / Loose, S. (Autor:in)


    Erscheinungsdatum :

    01.01.2005


    Format / Umfang :

    5503756 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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